问个双fbo的问题

sssa2000

使用2个fbo，第一个fbo 使用GL_COLOR_ATTACHMENT0_EXT，第二个使用GL_COLOR_ATTACHMENT1_EXT，第二个总是无法成功初始化。谁能帮我解答一下呢？

2个fbo初始化的代码几乎一样，如下，只是GL_COLOR_ATTACHMENT0_EXT 和GL_COLOR_ATTACHMENT1_EXT不同罢了


bool InitFbo(unsigned int iWidth,unsigned int iHeight)
{
        CreateEmptyTexture(img,iWidth,iHeight);
        // Setup our FBO
        glGenFramebuffersEXT(1, &fbo);
        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);

        // Create the render buffer for depth       
        glGenRenderbuffersEXT(1, &depthBuffer);
        glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, depthBuffer);
        glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, iWidth, iHeight);

        glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, img, 0);
        // Attach the depth render buffer to the FBO as it's depth attachment
        glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depthBuffer);


        GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
        if(status != GL_FRAMEBUFFER_COMPLETE_EXT)
                exit(1);

        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);       
        return true;
}